Nov. 27, 2024
The main reason that graphite electrodes are used in electrolysis is that graphite is an excellent conductor. The structure of graphite is such that it has a large number of electrons floating freely between the different layers of atoms (graphite bonds are formed of only three out of the four electron shells of the carbon atom, leaving the fourth electron to move freely). These electrons act as a powerful conductor, enabling the electrolysis process to progress smoothly. In addition, graphite is economical, stable at high temperatures and hard-wearing. For all these reasons, graphite electrodes are frequently used in electrolysis.
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Electrodes can be made from any conductive material. Depending on the nature of the application, electrodes are typically from graphite. Noble metals like gold, silver or platinum can be used but are very expensive. Copper, titanium and brass are other options, but they are also costly.
Graphite is used as an electrode material because it is a good conductor of electricity, is chemically stable, and can withstand high temperatures. It also has a low reactivity and thermal expansion coefficient, making it suitable for electrode use in electrochemical cells.
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Graphites unique structure, with layers of carbon atoms arranged in hexagonal, allows the electrons to move freely, making it a good conductor of electricity and useful as an electrode material.
In graphite, the carbon atoms are arranged in layers, retaining their structure through covalent bonds. A significant feature of graphites structure is the number of delocalized electrons present. Graphite requires only three of its outer energy electrons to bond, leaving the fourth free to act in a delocalized manner. Delocalized electrons are not readily associated with a particular atom and move freely. These electrons enable graphite to exhibit a high level of conductivity, explaining why the material is frequently used for electrodes.
Check out MWIs EDM Graphite Product Guide that contains information for our Electro-Carb EC family of graphite electrode materials. Graphite grades include EC-4, EC-12, EC-14, EC-15, EC-15C. EC-16, EC-17, HK-6, and HK-6C.
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